`timescale 1ns/1ns
module tb_led ();

    reg key;
    wire led;

    initial begin
        key<=1'b0; // Initialize key to 0
        #200
         key<=1'b1;
        #200
         key<=1'b0; // Toggle key back to 0
    end

    led u_led (
            .key(key),
            .led(led)
        );


endmodule
